Skimo Co

La Sportiva Sideral Boot


La Sportiva used decades of experience in footwear to create one of the most comfortable and functional ski mountaineering boots available. Testers report pain free forefeet and arches they didn't have in other brands and added warmth from the new insoles, just the things you want for those all-day tours. As far as functionality, a carbon-reinforced backbone and integrated Fast Lock closure system make for excellent skiability and one-motion transitions. The 68 degree range of motion and light weight will make you feel like running up the hill. Or save your energy and attach the optional power strap and spoiler and get after it on the down.

  • Built in flex zones on the Paulau™ thermo-moldable liners have a patent lacing system to provide a custom snug fit.
  • EZ Flex™ system on the tongue, borrowed from La Sportiva's proven mountain boots, provides unrestricted ankle motion.
  • Enjoy long strides with the unrestricted 68° of ankle motion provided by the CRP Cuff™.
  • WarmSole™ insole prevents cold transfer through the sole of the boot, making these warmer than other thin-shelled lightweight boots.
  • Transition quickly and easily with the Fast Lock™ closure system that switches modes with a one-handed flip of the buckle.
  • EZ Cable™ adjustable forefoot buckle works in conjunction with the flexible tongue so you can set it and forget it.
  • Reduce your heel slippage with a low-volume yet comfortable 2BT Tech Heel™.
  • LazerGrip Outsole™ aborbs shock under the ball of your foot while being harder in the toe and heel for confident rock and ice maneuvers.
  • Stiffness comes from the CRP backbone Vertebra Technology™ that works like an exoskeleton to deliver power.
  • Choose from casual to aggressive stances with three different forward lean options (12, 14, or 16 degrees).
  • Optional power strap (22g/0.8oz) and spoiler (22g/0.8oz) included in the box for those more downhill oriented.

convert to ounces
1165g [27]
Weight (pair) 2330g [27]
Buckles   2 w/ Fast Lock
Boot Sole Length   277mm [25/25.5]
287mm [26/26.5]
297mm [27/27.5]
307mm [28/28.5]
Binding Compatibility   Tech only
Cuff Rotation   68°
Forward Lean(s)   12°, 14°, 16°
Specs Verified Yes
Materials   Grilamid shell, PA12 nylon cuff, pebax tounge
Liner   Paulau with lacing system
Sole   LazerGrip w/ varying hardness
Skimo Co Says
Usage All-day ski mountaineering
Notes Flex zones, large range of motion, warm insoles, snug lacing, light and strong
Bottom Line Years of footwear experience equals most comfy fit for most

Questions & Reviews

Question from Daniel Jones
What is a good price for a lately used to ski boot of this red sideral model? A gear store is asking $315 for a lightly used pair
Answer from Teddy Young
Hey Daniel, thanks for reaching out! My apologies, I'm not sure what these boots have been going for on the used market recently.
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Question from Steve
Is there a dealer for the La Sportiva Sideral in Bozeman, MT? Thanks!
Answer from jbo
Hi Steve, not sure about local options, but we ship there :)
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Christopher W (used product a few times)
I have these boots and they seem to be a good entry-level rando race or skimo boot. The strap mechanism is very simple and functional, and you can unclip/reclip the strap without having to change the basic setting of the velcro. I haven't used the additional strap for stiffening, and they aren't especially stiff boots - but for my purposes this is not very important right now.

The major complaint I have is with sole durability, which has purportedly been corrected in the updated version (which these appear to be). My soles aren't falling off yet, with low mileage, but I can see where they are starting to deteriorate. I've bumped my review from 3 to 4 stars in light of the fact that LaSportiva appears to have corrected the problem in the newer boots.

Still, if I had to do it all over again, the Dynafit PDG boot would be my #1 pick for the price:
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Question from Mark Kreuzer
With the La Sportiva Sideral how would you think it sizes up against Scarpa. I ski the Scarpa - Terminator X Pro now and have a 26.5 which fix great. Used to ski a Technica Cochise in a 27.5 which fit really well. I know I should go get a shell fit but wondering if you have any insights into this.

--- Mark
Answer from jbo
Hi Mark, the Siderals have a similar fit to the Dynafit TLT series, meaning a tad short and narrow compared to a "beef" boot like the Cochise or an alpine boot. I had to go up a half size from my alpine ski boot size. However, given that you can fit into a 26.5/27 Scarpa shell, you probably won't need to size up past the 27.5. I would try that one first.
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Model: Sideral

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